Qt Documentation

starrating.cpp Example File

itemviews/stardelegate/starrating.cpp

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****************************************************************************/#include <QtGui>#include <math.h>#include "starrating.h"constint PaintingScaleFactor =20;
StarRating::StarRating(int starCount,int maxStarCount)
{
myStarCount = starCount;
myMaxStarCount = maxStarCount;
starPolygon <<QPointF(1.0,0.5);
for (int i =1; i <5; ++i)
starPolygon <<QPointF(0.5+0.5* cos(0.8* i *3.14),0.5+0.5* sin(0.8* i *3.14));
diamondPolygon <<QPointF(0.4,0.5) <<QPointF(0.5,0.4)
<<QPointF(0.6,0.5) <<QPointF(0.5,0.6)
<<QPointF(0.4,0.5);
}
QSize StarRating::sizeHint() const
{
return PaintingScaleFactor *QSize(myMaxStarCount,1);
}
void StarRating::paint(QPainter*painter,constQRect&rect,constQPalette&palette, EditMode mode) const
{
painter->save();
painter->setRenderHint(QPainter::Antialiasing,true);
painter->setPen(Qt::NoPen);
if (mode == Editable) {
painter->setBrush(palette.highlight());
} else {
painter->setBrush(palette.foreground());
}
int yOffset = (rect.height() - PaintingScaleFactor) /2;
painter->translate(rect.x(), rect.y() + yOffset);
painter->scale(PaintingScaleFactor, PaintingScaleFactor);
for (int i =0; i < myMaxStarCount; ++i) {
if (i < myStarCount) {
painter->drawPolygon(starPolygon,Qt::WindingFill);
} elseif (mode == Editable) {
painter->drawPolygon(diamondPolygon,Qt::WindingFill);
}
painter->translate(1.0,0.0);
}
painter->restore();
}